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>DataparkSearch Engine 4.54: Reference manual</TH
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><DIV
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><H1
><A
NAME="INDEXING"
></A
>Chapter 3. Indexing</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>3.1. <A
HREF="dpsearch-indexing.en.html#GENERAL"
>Indexing in general</A
></DT
><DT
>3.2. <A
HREF="dpsearch-http-codes.en.html"
>Supported HTTP response codes</A
></DT
><DT
>3.3. <A
HREF="dpsearch-content-enc.en.html"
>Content-Encoding support</A
></DT
><DT
>3.4. <A
HREF="dpsearch-stopwords.en.html"
>Stopwords</A
></DT
><DT
>3.5. <A
HREF="dpsearch-clones.en.html"
>Clones</A
></DT
><DT
>3.6. <A
HREF="dpsearch-follow.en.html"
>Specifying WEB space to be indexed</A
></DT
><DT
>3.7. <A
HREF="dpsearch-aliases.en.html"
>Aliases</A
></DT
><DT
>3.8. <A
HREF="dpsearch-srvtable.en.html"
>Servers Table</A
></DT
><DT
>3.9. <A
HREF="dpsearch-pars.en.html"
>External parsers</A
></DT
><DT
>3.10. <A
HREF="dpsearch-indexcmd.en.html"
>Other commands are used in <TT
CLASS="FILENAME"
>indexer.conf</TT
></A
></DT
><DT
>3.11. <A
HREF="dpsearch-extended-indexing.en.html"
>Extended indexing features</A
></DT
><DT
>3.12. <A
HREF="dpsearch-syslog.en.html"
>Using syslog</A
></DT
><DT
>3.13. <A
HREF="dpsearch-stored.en.html"
>Storing compressed document copies</A
></DT
></DL
></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="GENERAL"
>3.1. Indexing in general</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-CONF"
>3.1.1. Configuration</A
></H2
><P
>First, you should configure <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
>. Indexer
configuration is covered mostly by
<TT
CLASS="FILENAME"
>indexer.conf-dist</TT
> file. You can find it in
<TT
CLASS="LITERAL"
>etc</TT
> directory of <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> distribution. You may
take a look at other *.conf samples in <TT
CLASS="LITERAL"
>doc/samples</TT
>
directory. </P
><P
>To set up <TT
CLASS="FILENAME"
>indexer.conf</TT
>
file, change directory to <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> installation <TT
CLASS="LITERAL"
>/etc</TT
>
directory, copy <TT
CLASS="FILENAME"
>indexer.conf-dist</TT
> to
<TT
CLASS="FILENAME"
>indexer.conf</TT
> and edit it.</P
><P
>To configure search front-ends
(<TT
CLASS="FILENAME"
>search.cgi</TT
> and/or
<TT
CLASS="FILENAME"
>search.php3</TT
>, or other), you should copy <TT
CLASS="FILENAME"
>search.htm-dist</TT
> file in /etc directory 
of <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> 
installation to <TT
CLASS="FILENAME"
>search.htm</TT
> and edit it. See <A
HREF="dpsearch-templates.en.html"
>Section 8.3</A
>&#62; for detailed description.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-RUN"
>3.1.2. Running <B
CLASS="COMMAND"
>indexer</B
></A
></H2
><P
>Just run indexer once a week (a day, an hour
...) to find the latest modifications in your web sites. You may also
insert indexer into your <TT
CLASS="LITERAL"
>crontab</TT
> job.</P
><A
NAME="AEN573"
></A
><P
>By default, indexer being called without any
command line arguments reindex only expired documents. You can change
expiration period with <B
CLASS="COMMAND"
>Period</B
>

			<TT
CLASS="FILENAME"
>indexer.conf</TT
> command. If
you want to reindex all documents irrelevant if those are expired or
not, use <CODE
CLASS="OPTION"
>-a</CODE
> option. indexer will mark all documents
as expired at startup. </P
><P
>Retrieving documents, indexer sends
<TT
CLASS="LITERAL"
>If-Modified-Since</TT
> HTTP header for documents that
are already stored in database. When indexer gets  next document it
calculates document's checksum. If checksum is the same with old
checksum stored in database, it will not parse document again. indexer
<CODE
CLASS="OPTION"
>-m</CODE
> command line option prevents indexer from sending
<TT
CLASS="LITERAL"
>If-Modified-Since</TT
> headers and make it parse
document even if checksum is the same. It is useful for example when
you have changed your <B
CLASS="COMMAND"
>Allow/Disallow</B
> rules in
<TT
CLASS="FILENAME"
>indexer.conf </TT
> and it is required to add new pages
that was disallowed earlier.</P
><P
>If <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> retrieves URL with redirect HTTP
301,302,303 status it will index URL given in
<TT
CLASS="LITERAL"
>Location:</TT
> field of HTTP-header instead.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-CREATE-TABLES"
>3.1.3. How to create SQL table structure</A
></H2
><A
NAME="AEN591"
></A
><P
>To create SQL tables required for 
<SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> functionality, 
use <TT
CLASS="LITERAL"
>indexer -Ecreate</TT
>. Executed with this argument, 
indexer looks up a file containing SQL statements necessary for creating
all SQL tables for the database type and storage mode given
in <B
CLASS="COMMAND"
>DBAddr</B
> <TT
CLASS="FILENAME"
>indexer.conf</TT
> command. 
Files are looking up at <TT
CLASS="FILENAME"
>/share</TT
> directory of 
<SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> installation, which is usually 
<TT
CLASS="FILENAME"
>/usr/local/dpsearch/share/</TT
>. </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-DROP-TABLES"
>3.1.4. How to drop SQL table structure</A
></H2
><A
NAME="AEN603"
></A
><P
>To drop all SQL tables created by 
<SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
>,  use <TT
CLASS="LITERAL"
>indexer -Edrop</TT
>. 
A file with SQL statements required to drop tables are looking up at 
<TT
CLASS="FILENAME"
>/share</TT
> directory of <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
>
installation.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-SUBSECT"
>3.1.5. Subsection control</A
></H2
><P
>indexer has -t, -u, -s options to limit action
to only a part of the database. -t corresponds 'Tag' limitation, -u is
a URL substring limitation (SQL LIKE wildcards). -s limits URLs with
given HTTP status. All limit options in the same group are ORed and in
the different groups are ANDed.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-CLEARDB"
>3.1.6. How to clear database</A
></H2
><A
NAME="AEN615"
></A
><P
>To clear the whole database, use 'indexer
-C'. You may also delete only the part of database by using -t,-u,-s
subsection control options.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-DBSTAT"
>3.1.7. Database Statistics</A
></H2
><A
NAME="AEN620"
></A
><P
>If you run <TT
CLASS="LITERAL"
>indexer -S</TT
>, it
will show database statistics, including count of total and expired
documents of each status. -t, -u, -s filters are usable in this mode
too.</P
><P
>The meaning of status is:</P
><P
></P
><UL
><LI
><P
>0 - new (not indexed yet) URL</P
></LI
></UL
><P
>If status is not 0, then it is HTTP response code, some of the HTTP codes are:</P
><P
></P
><UL
><LI
><P
>					<TT
CLASS="LITERAL"
>200</TT
> - "OK" (url is successfully indexed)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>206</TT
> - "Partial OK" (a part of url is successfully indexed)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>301</TT
> - "Moved Permanently" (redirect to another URL)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>302</TT
> - "Moved Temporarily" (redirect to another URL)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>303</TT
> - "See Other" (redirect to another URL)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>304</TT
> - "Not modified" (url has not been modified since last indexing)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>401</TT
> - "Authorization required" (use login/password for given URL)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>403</TT
> - "Forbidden" (you have no access to this URL(s))</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>404</TT
> - "Not found" (there were references to URLs that do not exist)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>500</TT
> - "Internal Server Error" (error in cgi, etc)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>503</TT
> - "Service Unavailable" (host is down, connection timed out)</P
></LI
><LI
><P
>					<TT
CLASS="LITERAL"
>504</TT
> - "Gateway Timeout" (read timeout when retrieving document)</P
></LI
></UL
><P
><A
NAME="AEN667"
></A
>
			<TT
CLASS="LITERAL"
>HTTP 401</TT
> means that this
URL is password protected. You can use <B
CLASS="COMMAND"
>AuthBasic</B
>
command in <TT
CLASS="FILENAME"
>indexer.conf</TT
> to set
<TT
CLASS="LITERAL"
>login:password</TT
> for this URL(s).</P
><P
>			<TT
CLASS="LITERAL"
>HTTP 404</TT
> means that you
have incorrect reference in one of your document (reference to
resource that does not exist).</P
><P
>Take a look on <A
HREF="http://www.w3.org/Protocols/"
TARGET="_top"
>HTTP specific documentation</A
> for further explanation of different HTTP status codes.</P
><P
>Status codes <TT
CLASS="LITERAL"
>2xxx</TT
> are not in HTTP specification and they correspond to the documents marked as clones, 
where <TT
CLASS="LITERAL"
>xxx</TT
> - one of status codes described above.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-LINKVAL"
>3.1.8. Link validation</A
></H2
><A
NAME="AEN683"
></A
><P
>Being started with -I command line argument,
indexer displays URL and it's referrer pairs. It is very useful to
find bad links on your site. Don't use <B
CLASS="COMMAND"
>HoldBadHrefs 0</B
>
command in <TT
CLASS="FILENAME"
>indexer.conf</TT
> for this
mode. You may use subsection  control options -t,-u,-s in this
mode. For example, <TT
CLASS="LITERAL"
>indexer -I -s 404</TT
> will display
all 'Not found' URLs with referrers where links to those bad documents
are found. Setting relevant <TT
CLASS="FILENAME"
>indexer.conf</TT
> commands
and command line options you may use <SPAN
CLASS="APPLICATION"
>DataparkSearch</SPAN
> special for site
validation purposes.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="GENERAL-PARALLEL"
>3.1.9. Parallel indexing</A
></H2
><A
NAME="AEN693"
></A
><P
>It is possible to run several
indexers simultaneously with the same <TT
CLASS="FILENAME"
>indexer.conf</TT
> file. We have
successfully tested 30 simultaneous indexers with <SPAN
CLASS="APPLICATION"
>MySQL</SPAN
>
database. By default, <B
CLASS="COMMAND"
>indexer</B
> marks documents selected for indexing as expired in 4 hours in the future to avoid
double indexing of the same URL by different indexer. However this is not gives 100% garantee of avoiding such duplication.
You may use multi-threaded version of indexer
with any SQL  back-end though which does support several simultaneous
connections. Multi-threaded indexer version uses own locking
mechanism.</P
><P
>It is not recommended to use the same database
with different <TT
CLASS="FILENAME"
>indexer.conf</TT
> files! First process
could add something but second could delete it, and it may never
stop.</P
><P
>On the other hand, you may run several indexer
processes with different databases with ANY supported SQL
back-end.</P
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